The Engine Reprogramming Tool (ERT) is a Windows PC-based application to assist with flashing specific Engine ECUs or After treatment ACUs that do not follow the conventional Caterpillar Flash File process.

The ERT application can flash these specific ECUs and ACUswhen the service tool (Electronic Technician) is not currently capable of flashing these specific devices.

The ERT application expects a specific type of flash file known as a DPK file. The *.DPK fileextension differs from the traditional *.FLS, *.FL2 or *.FL3 file extensions used with the Electronic Technicians service tool. TThe ERT application is only meant to flash specific EngineClasses such as C1.8, C2.4, C3.3B and C3.8, plus an Aftertreatment ACU associated with the Tier4 Final Engine (C3.8). These Engine Classes are typically installed on SSL, CTL, MTL,certain Paving Products, CWL or other small construction machine equipment.